Particle Sizing to Distinguish Crushed Concrete from Exploded Concrete
This isn't my field, however, it seems a fairly straight-forward way to produce yet another body of evidence that could be easily verified independently. Although I have no access to the equipment necessary for this type of analysis, I am certain that the particles of crushed concrete will look categorically different from particles that have been in close proximity to highly energetic bursts. Those which have been exposed to explosions will have characteristic fractures that simple compression cannot produce.
Also, crushed concrete of a known variety will produce known amounts of particles of particular sizes--even when dropped 1400 feet. Particles smaller than this are automatically indicative of more energetic reactions. Thermodynamics cannot be fooled by propaganda.
Am I late to the game? Has this already been done?
EDIT: I've been corrected about that "certainty" thing.
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I'D LIKE TO KNOW
If the dust contained tiny particles of the steel used for the floor pans. I suspect thermite was placed on the floor pans and they were destroyed. This is why we see so few pans in the debris photos. When the pans were blown apart the concrete was pulverized.
See this for possible leads as this is an independent investigation of dust.
http://www.nyenvirolaw.org/WTC/130%20Liberty%20Street/Mike%20Davis%20LMDC%20130%20Liberty%20Documents/Signature%20of%20WTC...
Good idea
you're only late in the sense that this has been covered up by EPA already.
An early german source stated this back in winter 2001/2002: (google translated)
"The EPA has found that the WTC dust has a different granularity than has been at all similar, previous events of the case. Usually arise in the destruction of concrete and similar building materials scraps and crumbs of various sizes, dust is a byproduct. This can usually consists of larger particles that fall to the ground and quickly be removed with approved cleaning methods. Dust is a particulate matter and produced only in small amounts.
The WTC dust has just the opposite characteristics. At first there are normally expected chunks and crumbs almost complete missing. The materials have been pulverized completely. The dust itself consists mainly of the very finest particles, which otherwise occur only in small quantities. "
Out of: Christian Guthart, "Der 11. September, ein Untersuchungsbericht", published 2002
http://www.amazon.de/11-September-Untersuchungsbericht-Christian-Guthart/dp/3926575875/ref=sr_1_1?ie=UTF8&s=books&qid=1306...
I tried to follow his links, even back in 2003, they were all dead.
911research has mirrored a study, otherwise not be found:
http://911research.wtc7.net/cache/wtc/evidence/ehp_lioy_dust.html
It was anticipated that the actual compounds and materials present in the plume would be similar to those found in building fires or implosion of collapsed buildings. The primary differences would be the simultaneous occurrence of each type of event, the intense fire (> 1,000°C), the extremely large mass of material (> 10 106 tons) reduced to dust and smoke, and the previously unseen degree of pulverization of the building materials. A summary of the potentially present types of carcinogenic and noncarcinogenic materials was reported in EHP in November 2001.